Automatically openable umbrella

ABSTRACT

An automatically openable umbrella equipped with attachment members each being securely mounted on a rib and having a nonextensible supporting spoke pivotably attached at one end thereto and at the other end to a slidable lower ring mounted on a vertical shaft, and also with extensible pushing members each being pivotably attached at one end to said attachment member in spaced and independent relation from said supporting member and at the other end to a slidable intermediate ring, whereby the cloth of the umbrella is always maintained taut in its opened state even when the cloth expands due to its absorption of moisture.

PATENTEDfrE-az3197i 3565087 SHEET-1M4 I l 2 INVENTQRS UMY W ATTORNEYS I United States Patent 1 1 3,565,087

[72] Inventors Choji Arai [56] References Cited Showa-Machi; UNITED STATES PATENTS Yukio Saw, TokymJapan 319,225 6/1885 Gilardini 135/22 1 pp 877,213 559,144 4/1896 Muller 135/22 1 PM 17,1969 923,130 6/1909 Beaudry 135/23 1 Patented 1971 1,067,435 7/1913 McNamara 135/22x [73] Assignee Ideal Shoji Co., Ltd.

Tamyku, Tokyo, Japan Primary Examiner-Kenneth Downey 32 Priority Jan. 25, 1969, Jan. 25, 1969, Jan. 25, 1969 Darby & Cushman [33] Japan [31] 44/666844/6669 and 44/6670 ABSTRACT: An automatically openable umbrella equipped with attachment members each being securely mounted on a rib and having a nonextensible supporting spoke pivotably attached at one end thereto and at the other end to a slidable lower ring mounted on a vertical shaft, and also with extensible ushing members each being pivotably attached at one [54] AUTQMATICAUZY (ENABLE UMBRELLA end :0 said attachment member in spaced and independent 7 Clams ll Drawmg relation from said supporting member and at the other end to [52] Us, (I 135/23 a slidable intermediate ring, whereby the cloth of the umbrella [51] Int. CL. A45b 25/16 is always maintained taut in its opened state even when the [50] Field of Search .Q. 135/22-24 cloth expands due to its absorption of moisture.

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INVENTORS ATTORNEY:

AUTOMATICALLY OPENABLE UMBRELLA The present invention is concerned with an umbrella, and more specifically, it relates to an automatically openable umbrella, and still more particularly, it relates to an umbrella which not only opens automatically upon a pressure applied to the button provided on the vertical shaft to release the engagement between the slidable lower ring carrying the nonextensible supporting spokes and a hook, but also the required tension or tautness of the spread cloth of the umbrella is maintained even when the cloth becomes wet and slackened.

In an umbrella of the automatically openable type that the ribs are adapted to be opened radially outwardly by the cooperation of the spring force afforded by the compressed coil spring provided around the hollow vertical shaft adjacent to the lower end of a fixed ring secured to the upper portion of the shaft and by the pushing force afforded by the pushing members pivotably extending from a slidable intermediate ring mounted on said hollow vertical shaft when the lower slidable ring mountedon the hollow vertical shaft is relieved from its state of being locked thereon by a latch means provided on the lower end portion of the hollow vertical shaft, the invention lies inthe arrangement that each spring-driven tele scopic rod means whichis pivotably secured at one end to the slidable intermediate ring slidably mounted on the hollow vertical shaft of theumbrella frame is pivotably secured at the other end to a pin of a metal fitting secured to the middle portion of the rib, while each nonextensible supporting spoke pivotably secured at one end to the slidable lower ring mountedslidably on said shaft is pivotably secured to another pin which is spaced from the first securing pin and is attached to the same metal fitting, so that the telescopic rod means and the nonextensible supporting spoke are pivotably secured to two pins which are spaced from each other. This arrangement of the umbrella provides the following function that, when the cloth which is made of a material such as nylon fabric and which covers the entire surfaces of the ribs becomes wet in the rain after the umbrella is opened and absorbs the moisture and expands to some extent and loses some of its initial tension, the telescopic rod means is automatically caused to extend its length for some distance to further spread the ribs radially outwardly to a slight degree, and along with this, the slidable lower ring is caused to move upwardly for some distance on the hollow vertical shaft by being pulledupward by the supporting spokes, causing the supporting spokes to act so as to pull the ribs inwardly. As a result, the slackened cloth of the umbrella resumes its initial tension with which the cloth spread taut. In this way, the umbrella can always retain its good appearance after it has been opened once, without developingslackening of the cloth regardless of the weather, whether rain or shine.

According to the present invention, there is provided an automatically openable umbrella having a vertical shaft equipped with a slidable lower ring carrying a plurality of supporting spokes for supporting respective ribs, said shaft being provided at the lower portion of said shaft with a latch means arranged to engage and latch said slidable lower ring when the umbrella is closed, said shaft being further equipped with a slidable intermediate ring carrying a plurality of pushing members for radially outwardly pushing said ribs and arranged to be pressed downwardly by a compressed springmounted above said intermediate ring on said shaft below a fixed ring carrying said ribs to the extent that the umbrella is completely opened, said umbrella comprising a spring means for said pushingmember 8 to extend the length of said pushing member to resiliently press further the corresponding rib and a fitting means provided on said rib and having a pair of spaced-apart attachment members for. pivotably attaching thereto said supporting spoke and said pushing member in spaced and independent relation with each other so that said extensible pushing member is enabled to radially and outwardly push said rib independently of said inextensible supporting spoke, whereby enabling the opened umbrella to always maintain the taut full spread condition of the covering.

clothof the umbrellawithout causing slackening of the cloth resulting from its expansion when wet.

The objects and advantages of the present inventionwill become apparent by reading the following detailed description in conjunction with the accompanying drawings, in which:

FIG. 1 is a somewhat diagrammatic vertical side elevational view, partly in section, showing the relative positions and the connections of the respective constitutional members of the umbrella frame of the present invention when the umbrella is substantially closed;

FIG. 2 is a similar view when the umbrella is in its open state for actual use;

FIG. 3 is a somewhat diagrammatic, enlarged fragmental side elevational view, partly in section, of the umbrella frame in FIG. 1, showing the state in which the respective spring means are compressedas the opened umbrella is about to be closed by lowering the position assumed by the slidable lower ring on the hollow vertical shaft of the umbrella at the time the umbrella is in its open state;

FIG. 4 is a somewhat diagrammatic, enlarged fragrnental side elevational view, partly 'in section, of the umbrella frame in FIG. 1, showing the manner how the initial required tension of the cloth of the umbrella in its open state is restored as the ribs are slightly warped outwardly after the cloth has lost some of its initial tension due to its absorption of moisture;

FIG. 5 is a somewhat diagrammatic fragmentary side elevational view, in an enlarged scale, showing the manner in which the fixed ring attached to the vicinity of the upper end of the hollow vertical shaft of the umbrella is associated, by a coil spring, with the intermediate-slidable ring located below said fixed ring and mounted on the vertical shaft;

FIG. 6 is a perspective view of the intermediate slidable ""8;

FIG. 7 is a perspective view of a guide rod;

FIG. 8 is a perspective view of a modification of the guide rod;

FIG. 9- is a vertical side elevational view in an enlarged scale, showing the state of the guide rod when attached to the vertical shaft;

FIG. 10 is a perspective view of a telescopic rod means;

FIG. 11 is a perspectiveview of a modification of the telescopic rod means.

Referring now to the drawings, reference. numeral 1 represents a hollow vertical shaft, and this shaft is made of a pipe in this example. This vertical shaft 1 has an upper end portion called ferrule la. A fixed ring 2 is secured to thebase portion of this ferrule 1a. A plurality of ribs 3 extend radially from the fixed ring Zin such away that the upper end of each rib is pivotably attached to the fixed ring 2. A metal fitting 4 having a shape such as shown in FIG. 10 is secured to an intermediate portion'of each rib 3. This metal fitting 4, in this example, is of a generally semicylindrical configuration having'lugs 4a and 4b projecting from'the intermediate portions of the longitudinal bilateral edges so that the inner faces of these lugs face each other. Pins 50 and 5b are secured between the opposing lugs 4a and 4b insuch a way that these pins 5a and 5b are spaced from each other. A pivotable sleeve 6 is pivotably secured, at one end, to one 5a of pins 5a and 5b. In this sleeve 6 is inserted through its open other end, for free slidable movement, an end portion of a rod 8 having a coil spring 7 wound around the circumference thereof. In the example of FIGS. 1 through 4, the other end portion of the rod 8 is inserted, for free slidable movement, in an open end portion of another sleeve 9 having its other end pivotably secured to a slidable intermediate ring 10 which, in turn, is slidably mounted on the vertical shaft 1. The coil spring. 7 extends between the opposing free ends of the two sleeves 6 and 9.

As a modification of the spring-driven teleseopicrod means, it may be of the structure comprising a single sleeve 6 pivotably secured at one end to the pin 5a and a rod having a coil spring 7 wound'therearound and extending between the free end of the sleeve 6 and the slidable intermediate rin'g10, said rod having an end portion slidably insertedin the open end portion of said sleeve 6, with the other end of said rod being pivotably secured to the slidable intermediate ring 10, as.

shown in FIG. 11.

As best seen in FIG. 1, a compressed coil spring 11 of an appropriate length is mounted on the hollow vertical shaft between the lower end face of the fixed ring 2 and the upper end face of the slidable intermediate ring 10, so as to expand therebetween.

It should be understood that the pivotable sleeves 6 and 9 may be replaced by a cylindrical member or members provided that the rod 8 can be inserted for slidable movement in said cylindrical member or members. A nonextensible supporting spoke 12 is pivotably secured, at one end, to the other b of the spaced pins 5a and 5b of the metal fitting 4. The other end of the supporting spoke 12 is pivotably secured to a slidable lower ring 13 which, in turn, is slidably mounted on the hollow vertical shaft 1. A latch means 14 is provided within the hollow vertical shaft 1 in a lower portion thereof close to the grip lb or handle of the umbrella frame. This latch means 14, according to this embodiment, comprises a curved spring leaf having a pressing button 140 protruding outwardly from the lowermost end of the spring leaf and also having an outwardly projecting hook 14b spaced at an appropriate distance from the button 14a. This hook 14b and said button 144 nonnally emerge outwardly of the wall of the hollow vertical shaft through an elongated longitudinal narrow slit formed through said wall of the hollow vertical shaft 1 on one side in the lower end portion of the hollow vertical shaft.

The slit and the spring leaf are of such size that the leaf is always retained within the hollow vertical shaft 1. The slidable lower ring 13 is of such a shape that it has a hollow cylindrical portion extending downwardly from the base ring to which one end of each supporting spoke 12 is pivotably secured. Said hollow cylindrical portion of the slidable lower ring 13 is provided with an elongated slot 13a on one side thereof. This slot 13a of the cylindrical portion of the slidable lower ring 13 is positioned so as to be aligned with the narrow slit formed in the hollow vertical shaft 1 when the slidable lower ring 13 is pulled downwardly to overlie said latch means. The slot 130 is of a size which permits the hook 14b of the latch means 14 to freely pass therethrough after emerging from the narrow slit of the vertical shaft. As ,this slidable lower ring 13 which is slidably mounted on the hollow vertical shaft 1 is pulled downwardly on the shaft 1 up to a position close to the grip 1b, the outwardly projecting hook 14b will first engage the lowermost end edge of the cylindrical portion of the slidable lower ring 13 and is then pressed inwardly by said edge to submerge into the narrow slit formed in the hollow vertical shaft 1. As the cylindrical portion of the slidable lower ring 13 is continuously pulled downwardly over the lower end portion of the hollow vertical shaft 1 past the submerged hook 14b, the latter is released of the applied pressure and plunges outwardly through the narrow slit and then through the enlongated slot 13a which is fonned in the cylindrical portion of the slidable lower ring 13 and which, at this moment, is aligned, in superposed abutting relation, with said narrow slit. As a result, the projecting hook latches the lowermost edge of the slot 13a of the cylindrical portion of the slidable lower ring 13 to restrict the upward movement of said ring 13 and to retain the umbrella in its closed state. Numeral 15 represents a stopper pin to support the lower end face of the slidable intermediate ring which is adapted to slide on the hollow vertical shaft 1, and to restrict the indefinite downward sliding movement of said intermediate ring 10. The slidable intennediate ring 10 is allowed to descend on the hollow vertical shaft 1, as it is urged by the spring force of the compressed coil spring 11, until the lower end face of the intermediate ring 10 hits the stopper pin 15. Said slidable intermediate ring 10 is provided with a vertical groove 16 on the inner wall surface of the centrally formed bore 10a of this ring. A guide rod 17 is secured, in an appropriate manner, to the hollow vertical shaft 1 so as to extend longitudinally along and in contact with the outer surface of the hollow vertical shaft 1 on one side thereof, from a position slightly upper or below said stopper pin to a position upward of this pin close to the lower face of the fixed ring 2. The longitudinally extending portion of this guide rod 17 is inserted in said vertical groove 16 formed in the inner wall face of the slidable intermediate ring 10 so that the slidable intermediate ring 10 is guided rectilinearly longitudinally on the hollow vertical shaft 1 without turning about this shaft. In the example shown in FIG. 1, 2 and 3, the guide rod 17 is of a shape such that it has opposite end portions which are bent in perpendicular relation to the vertically extending portion of the rod, to form two bent end portions 17a and 17a. This guide rod 17 is secured to the hollow vertical shaft 1 by passing these bent end portions 17a and 17a into the hollow vertical shaft 1 through the wall thereof.

As a modification of the shape of the guide rod 17, the lower end portion of the rod may have an outwardly projecting bent portion or loop as shown at 17b in FIGS. 8 and 9. In this instance, said outwardly projecting bent portion 17b serves also as a stopper for restricting the indefinite downward sliding movement of the slidable intermediate ring 10, and therefore, the provision of the stopper pin 15 may be omitted when this modified guide rod is used.

Onto the entire outer or upper surfaces of the respective ribs 3 is applied and secured a cloth 18 cut and stitched into a shape and size slightly smaller than the entire area of the conical shape which is formed by the outer or upper surfaces of the ribs 3.

When the button 14a of the latch means 14 is pressed upon by the tip of a finger-while the umbrella is in its closed stateto release the slidable lower ring 13 from its state of being latched by the hook 14b, the compressed coil spring 11 is allowed to resume its uncompressed state by virtue of its own spring force. This force exerted by the coil spring 11 urges the slidable intermediate ring 10 to lower its position on the ho]- low vertical shaft 1 until it hits the stopper pin 15. whereupon, the coil spring 7-which is mounted on the rod 8 inserted, at one end portion, in the sleeve 9 pivotably secured at one end to the slidable intermediate ring 10 and also inserted, at the other end portion, in the sleeve 6 pivotably secured at one end to the pin 5a of the metal fitting 4 secured to the rib 3 and which has till then been compressed-is allowed to expand lengthwise by virtue of its own spring force. As a result, the opposite end portions of the rod 8 which have been received in the sleeves 6 and 9 are exposed more of its length from these two sleeves. The sleeves 6 and 9 are arranged so that the rod 8 is not completely withdrawn outside from these sleeves during the expansion of the coil spring 7. As a consequence, the combination of the rod 8 and the sleeves 6 and 9 jointly exerts a powerful telescopic action to increase the distance between the facing open ends of both sleeves 6 and 9 to thereby spread the ribs 3 radially outwardly about the fixed ring 2 which is mounted on the upper portion of the hollow vertical shaft 1.

As a modified example of the spring-driven telescopic rod means, the rod 8 may be pivotably secured, at one end, directly to the slidable intermediate ring 10, with the other end inserted in a sleeve 6 which, in turn, is pivotably secured to the pin 50 of the metal fitting 4. In this arrangement, which is shown in FIG. 11, the telescopic action of the telescopic rod means is as follows. Upon the application of a pressure on the button to release the engagement of the hook 14b from the lowermost edge of the slot of the cylindrical portion of the slidable lower ring 13, the slidable intermediate ring 10 is lowered of its position on the hollow vertical shaft 1, by the spring force of the compressed coil 11, up to a level at which the lower end face of the slidable intermediate ring 10 hits the pin 15. Simultaneously with this, the coil spring 7, mounted on the rod 8 having one end portion inserted, for free sliding movement, in the sleeve 6 pivotably secured at its one end to the pin 5a of the metal fitting 4 of the rib 3 is allowed to extend its length in such a way that the rod 8 is withdrawn for some distance from the sleeve 6 to increase the length of the telescopic rod means, thereby causing the rib 3 to be pushed and spread radially outwardly about the fixed ring 2, while the supporting spoke 12 pivotably secured at one end to the pin 5b of the metal fitting 4 is caused to act so as to pull the slidable lower ring 13 upward for some distance on the hollow vertical shaft 1 and to stop it at the end of this distance.

As the ribs are thus spread radially outwardly, the cloth 18 which is securely applied to the entire upper surfaces of the ribs 3 is caused to spread accordingly. Along with the spreading movement of the ribs, the nonextensible supporting spokes 12 each of which is pivotably secured, at one end, to the pin 5b (which is spaced from the pin 5a) of the metal fitting 4 in spaced relation from said telescopic rod means and at the other end to the slidable lower ring U are caused to pull the slidable lower ring 13 upward for some distance on the hollow vertical shaft 1 independently of said telescopic rod means, causing the ring 13' to stop after it has covered this distance to restrict the radial outward spreading movement of the ribs. In this way, the ribs 3 are somewhat pulled radially inwardly by the nonextensible supporting spokes 12 at the sites of the metal fittings 4 secured to the ribs, via the pins 5b. Accordingly, the ribs 3 become slightly warped outwardly in a gentle arc shape when viewed laterally. As a consequence, the cloth 18 which is securely applied to the entire upper surfaces of the ribs is caused to spread taut to the maximum extent. More specifically, the cloth-carrying ribs 3 'are caused to spread radially outwardly up to the position in which the tension of the cloth 18 is in balance with the spring forces afforded by the coil spring 7 mounted around the rod 8 and by the coil spring 11 mounted on the upper .portion of the hollow vertical shaft 1. Thus, the umbrella is caused to automatically open.

Recently, in many of the umbrellas are used cloths made of nylon fabrics. However, nylon cloths are of the nature to expand slightly whenever they absorb moisture. In case nylon cloths are used with umbrella frames of the prior art, it occurs that the cloth which has been in the state of being spread taut before rainfall expands to some extent as the cloth becomes wet and absorbs moisture, resulting in the slackening of the taut cloth and accordingly in the loss of good appearance which is expected of the opened umbrella.

According to the present invention, there is obtained the following advantage that, when the taut spread cloth 18 of the opened umbrella becomes slackened as a result of an expansion due to its absorption of moisture, the spring force exerted by the coil springs 7 of the spring-driven telescopic rod means which has till then been in balance with the initial tension of the taut cloth will exceed the decreased tension resulted from the expanded cloth, and they stretch. for some distance, respectively. As a result, the lengths of the telescopic rod means increase to some extent, so that the ribs 3 are caused to radially outwardly spread further to a slight degree to render the slackened cloth to the state of being taut, thus enabling the opened umbrella to always maintain its good appearance.

In the umbrella of the present invention, a. nontelescopic supporting spoke 12 is pivotably coupled to the pin 5b of the metal fitting 4 and also to the slidable lower ring 13. This arrangement works in such a way that, when the ribs 3 are caused to spread radially outwardly further to some extent from the initially opened position of the umbrella to thereby urge the metal fitting 4 secured to the middle portion of the ribs 3 to displace outwardly to a slight-degree, the slidable lower ring 13 which has till then been resting stationary and loosely on the hollow vertical shaft 1 is caused to make an upward sliding movement on said shaft 1 for some distance and it stops at the end of this distance, as indicated by the dot-anddash lines in FIG. 4. It is to be noted that the spring-driven telescopic rod means is pivotably attached at one end to one pin 50 which is secured between the opposing lugs 4a and 4b of the metal fitting 4, while the nonextensible supporting spoke 12 is pivotably attached at one end to spaced another pin 5!) which is secured similarly between the opposing lugs 4a and 4b of the metal fitting 4. This means that the spring-driven telescopic rod means and the nonextensible supporting spoke 12 extend from different and spaced pins 5a and 5b, respectively. This novel arrangement of the telescopic rod means and the supporting spoke permits the operation that, when the metal fitting4 secured 'to' the middle portion of the rib 3 untelescopic rod means which is pivotably secured at one end to one So of the spaced pins 5a and 5b, the nontelescopic supporting spoke 12 which is pivotably secured at one end to the other 5b of these two pins is caused to make free pivotal movement about this pin 5b, pulling the slidable lower ring 13 upward on the hollow vertical shaft 1 for smooth upward displacement until the tension of the cloth is in balance with the spring forces of the coil springs. Thus, this further radial outward spreading movement of the ribs 3 from its initial open position which has been established before the cloth becomes wet is not obstructed in any way, and accordingly, the open umbrella is always maintained in the taut spread state of the cloth.

it is to be understood that said metal fitting need not be made with a metal, but that it may be made with an appropriate plastic material having a strong mechanical strength.

It should also be understood that the present invention is not limited to the foregoing embodiments which are given simply for illustrative purposes.

We claim:

1. An automatically openable umbrella having a vertical shaft equipped with a slidable lower ring carrying a plurality of inextensible supporting spokes for supporting respective ribs, a covering cloth supported on said ribs, said shaft being provided at the lower portion of said shaft with a latch means arranged to engage and latch said slidable lower ring when the umbrella is closed, said shaft being further equipped with a slidable intermediate ring carrying a plurality of extensible pushing members for radially outwardly pushing said ribs and arranged to be pressed downwardly by a compressed spring mounted above said intermediate ring on said shaft to the extent that the umbrella is completely opened, compression spring means for each said pushing member (8) to extend the length of said pushing member to resiliently press further the corresponding rib, and a fitting means provided on each said rib and having a pair of spaced-apart attachment members for pivotably attaching thereto said supporting spoke and said pushing member in spaced and independent relation with each other so that said extensible pushing member is enabled to radially and outwardly push said rib independently of said in extensible supporting spoke, whereby enabling the opened umbrella to always maintain the taut full spread condition of the covering cloth of the umbrella without causing slackening of the cloth resulting from its expansion when wet.

2. An automatically openable umbrella according to claim 1, in which said pushing member comprises a pair of spaced receiving elements, a piece of rod having opposite end portions received in said receiving elements, said spring means being compressed coil spring mounted on said rod and extending between the opposing open ends of said receiving elements.

3. An automatically openable umbrella according to claim 1, in which said attachment member carries a pair of spaced pins, one of which is for pivotably attaching said pushing member thereto and the other is for pivotably attaching said inextensible supporting spoke thereto in spaced relation with and independently of said pushing member.

4. An automatically openable umbrella according to claim l, in which said vertical shaft is provided with a guide rod exdergoes an outward displacement due to the stretching of the tending longitudinally on the wall surface of said shaft, and said slidable intermediate ring is provided with a vertical groove to slidably receive said guide rod for insuring longitudinal linear sliding movement of said ring on the shaft.

5. An automatically openable umbrella according to claim 1, in which said vertical shaft is provided with a stopper means on its wall surface for restricting the downward movement of said slidable intermediate ring.

6. An automatically openable umbrella according to claim 2, in which said receiving element is sleeve having an open end for receiving said rod.

7. An automatically openable umbrella according to claim 5, in which said stopper means is a pin projecting outwardly from the wall surface of said vertical shaft. 

1. An automatically openable umbrella having a vertical shaft equipped with a slidable lower ring carrying a plurality of inextensible supporting spokes for supporting respective ribs, a covering cloth supported on said ribs, said shaft being provided at the lower portion of said shaft with a latch means arranged to engage and latch said slidable lower ring when the umbrella is closed, said shaft being further equipped with a slidable intermediate ring carrying a plurality of extensible pushing members for radially outwardly pushing said ribs and arranged to be pressed downwardly by a compressed spring mounted above said intermediate ring on said shaft to the extent that the umbrella is completely opened, compression spring means for each said pushing member (8) to extend the length of said pushing member to resiliently press further the corresponding rib, and a fitting means provided on each said rib and having a pair of spaced-apart attachment members for pivotably attaching thereto said supporting spoke and said pushing member in spaced and independent relation with each other so that said extensible pushing member is enabled to radially and outwardly push said rib independently of said inextensible supporting spoke, whereby enabling the opened umbrella to always maintain the taut full spread condition of the covering cloth of the umbrella without causing slackening of the cloth resulting from its expansion when wet.
 2. An automatically openable umbrella according to claim 1, in which said pushing member comprises a pair of spaced receiving elements, a piece of rod having opposite end portions received in said receiving elements, said spring means being compressed coil spring mounted on said rod and extending between the opposing open ends of said receiving elements.
 3. An automatically openable umbrella according to claim 1, in which said attachment member carries a pair of spaced pins, one of which is for pivotably attaching said pushing member thereto and the other is for pivotably attaching said inextensible supporting spoke thereto in spaced relation with and independently of said pushing member.
 4. An automatically openable umbrella according to claim 1, in which said vertical shaft is provided with a guide rod extending longitudinally on the wall surface of said shaft, and said slidable intermediate ring is provided with a vertical groove to slidably receive said guide rod for insuring longitudinal linear sliding movement of said ring on the shaft.
 5. An automatically openable umbrella according to claim 1, in which said vertical shaft is provided with a stopper means on its wall surface for restricting the downward movement of said slidable intermediate ring.
 6. An automatically openable umbrella according to claim 2, in which said receiving element is sleeve having an open end for receiving said rod.
 7. An automatically openable umbrella according to claim 5, in which said stopper means is a pin projecting outwardly from the wall surface of said vertical shaft. 